The error is pretty clear. You are calling execute passing it a value to bind to a bind point ($form_values{'grp_name'}), but the SQL statement that you have prepared doesn't contain any bind points to bind that data to.

You need to either remove that parameter from your call to execute or add a bind point (i.e. a '?') to the SQL statement.

--
<http://www.dave.org.uk>

"The first rule of Perl club is you do not talk about Perl club."
-- Chip Salzenberg